Date: Fri, 5 Feb 2021 10:02:09 -0500 From: Alex Gaynor <alex.gaynor@...il.com> To: oss-security@...ts.openwall.com Subject: Re: CVE-2021-20226 kernel: use-after-free in io_uring feature Hey, Your message says that this is a DoS, however the ZDI page says it's a priv-esc. Which is right? Alex On Fri, Feb 5, 2021 at 10:00 AM Rohit Keshri <rkeshri@...hat.com> wrote: > > Hello Team, > > A use-after-free flaw was found in the io_uring in Linux kernel, where a > local attacker with a user privilege could cause a denial of service > problem on the system > > The issue results from the lack of validating the existence of an object > prior to performing operations on the object by not incrementing the file > reference counter while in use. > > The highest threat from this vulnerability is to data integrity, > confidentiality and system availability. > > > 'CVE-2021-20226' was assigned by Red Hat. > > This issue was reported by Ryota Shiga of Flatt Security Team. > > > Reference: > > https://www.zerodayinitiative.com/advisories/ZDI-21-001/ > > > Thanks and Regards > .. > Rohit Keshri / Red Hat Product Security Team > PGP: OX01BC 858A 07B7 15C8 EF33 BFE2 2EEB 0CBC 84A4 4C2D > > secalert@...hat.com for urgent response -- All that is necessary for evil to succeed is for good people to do nothing.
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